820909028 has 12 divisors (see below), whose sum is σ = 1436942640. Its totient is φ = 410353992.

The previous prime is 820909027. The next prime is 820909049.

820909028 is nontrivially palindromic in base 10.

820909028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 820908982 and 820909000.

It is not an unprimeable number, because it can be changed into a prime (820909027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4958 + ... + 40821.

It is an arithmetic number, because the mean of its divisors is an integer number (119745220).

Almost surely, 2^820909028 is an apocalyptic number.

It is an amenable number.

820909028 is a deficient number, since it is larger than the sum of its proper divisors (616033612).

820909028 is a wasteful number, since it uses less digits than its factorization.

820909028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50266 (or 50264 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 820909028 is about 28651.5100474652. The cubic root of 820909028 is about 936.3359050185.

The spelling of 820909028 in words is "eight hundred twenty million, nine hundred nine thousand, twenty-eight".